USN-4738-1

    Dashboard / Vulnerabilities / USN-4738-1

    USN-4738-1

    Published: 18 Feb 2021Last Modified: 27 Apr 2026

    Summary: openssl, openssl1.0 vulnerabilities

    Details: Paul Kehrer discovered that OpenSSL incorrectly handled certain input lengths in EVP functions. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23840) Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer fields. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23841)

    References: https://ubuntu.com/security/notices/USN-4738-1, https://ubuntu.com/security/CVE-2021-23840, https://ubuntu.com/security/CVE-2021-23841

    Affected packages

    Package

    Name: openssl

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.0.2g-1ubuntu4.19

    Affected versions

    1.0.2d-0ubuntu1
    1.0.2d-0ubuntu2
    1.0.2e-1ubuntu1
    1.0.2f-2ubuntu1
    1.0.2g-1ubuntu2
    1.0.2g-1ubuntu3
    1.0.2g-1ubuntu4
    1.0.2g-1ubuntu4.1
    1.0.2g-1ubuntu4.2
    1.0.2g-1ubuntu4.4
    1.0.2g-1ubuntu4.5
    1.0.2g-1ubuntu4.6
    1.0.2g-1ubuntu4.8
    1.0.2g-1ubuntu4.9
    1.0.2g-1ubuntu4.10
    1.0.2g-1ubuntu4.11
    1.0.2g-1ubuntu4.12
    1.0.2g-1ubuntu4.13
    1.0.2g-1ubuntu4.14
    1.0.2g-1ubuntu4.15
    1.0.2g-1ubuntu4.16
    1.0.2g-1ubuntu4.17
    1.0.2g-1ubuntu4.18

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-4738-1 | CVE-DB